Granulator shear pin safety mechanism

Abstract

A granulator shear pin safety mechanism includes a shear pin housing disposed on a granulator frame or a gear box, a shear pin flange covered on an end surface of the shear pin housing, a shear pin disposed between the housing and the flange, a limit switch disposed on the housing, and a shear pin shroud hinged with the housing. The housing is penetrated by a main shaft of the granulator, the flange is connected to the main shaft, and the shear pin shroud covers a terminal of the main shaft. The limit switch is connected to a power control device. When the limit switch detects that a rotation displacement occurs for the flange, the power control device stops the granulator. A granulator shear pin safety mechanism have a two-piece shear pin shroud, suitable for a granulator having a remote roll adjust drive.

What is claimed is: 
     
         1 . A granulator shear pin safety mechanism, comprising:
 a shear pin housing, disposed on a granulator frame or a gear box of a granulator, and penetrated through by a main shaft of the granulator;   a shear pin flange, covered on an end surface of the shear pin housing, and connected to the main shaft of the granulator;   at least one shear pin arranged between the shear pin flange and the shear pin housing;   a first limit switch, disposed on the shear pin housing and connected to a power control device of the granulator, for detecting whether a rotation displacement occurs for the shear pin flange; and   a shear pin shroud, hinged with the shear pin housing and covering a terminal of the main shaft,   wherein when the first limit switch detects that the rotation displacement occurs for the shear pin flange, the power control device stops the granulator according to the detection that the rotation displacement occurs for the shear pin flange.   
     
     
         2 . The granulator shear pin safety mechanism of  claim 1 , wherein one side of the shear pin shroud is hinged with the shear pin housing, and the other side of the shear pin shroud is connected with the shear pin housing through a clamp; and
 the granulator shear pin safety mechanism further comprises a second limit switch disposed on the clamp and connected to the power control device, for determining whether the shear pin shroud is in an open position or not, and when the second limit switch determines that the shear pin shroud is in the open position, the power control device stopes the granulator according to the determination that the shear pin shroud is in the open position.   
     
     
         3 . The granulator shear pin safety mechanism of  claim 1 , wherein the terminal of the main shaft of the granulator is connected with a lubricating swivel head for connecting to a lubricating line. 
     
     
         4 . The granulator shear pin safety mechanism of  claim 3 , wherein the shear pin shroud has an insertion slot for the lubricating line to pass through. 
     
     
         5 . The granulator shear pin safety mechanism of  claim 1 , wherein a middle portion of the shear pin is opened with a groove, and the groove is located at a position of a fitting end surface of the shear pin flange and a fitting end surface of the shear pin housing. 
     
     
         6 . The granulator shear pin safety mechanism of  claim 5 , wherein a gap exists between the fitting end surface of the shear pin flange and the fitting end surface of the shear pin housing, and a width of the gap is substantially the same as a width of the groove in the middle portion of the shear pin. 
     
     
         7 . A granulator shear pin safety mechanism for a granulator, comprising:
 a granular supporting frame;   a main shaft inserted in the granular supporting frame, and fixed to the granular supporting frame by a shear pin so as to restrict rotation of the main shaft;   a remote roll adjust drive installed to an end of the main shaft, and fixed to the granular supporting frame; and   a shear pin shroud disposed at an outside of the main shaft,   wherein the shear pin shroud includes two shroud pieces in a shape of a clam shell, the two shroud pieces are disposed at two sides of the main shaft, each of the two shroud pieces has a fixing end pivotally connected to the granular supporting arm and a free end, and the two shroud pieces protect the end of the main shaft and the shear pin inside when the two shroud pieces are closed; and   wherein a latch clip is installed to the shear pin shroud, and configured to lock the two shroud pieces.   
     
     
         8 . The granulator shear pin safety mechanism of  claim 7 , further comprising a sensor switch fixed to the granular supporting frame, wherein the sensor switch is configured to detect whether the two shroud pieces are open or not, and when the two shroud pieces are detected open, the sensor switch is configured to stop the granulator. 
     
     
         9 . The granulator shear pin safety mechanism of  claim 7 , further comprising a torsion spring disposed at the fixing ends of the two shroud pieces, to maintain opening positions of the two shroud pieces. 
     
     
         10 . The granulator shear pin safety mechanism of  claim 7 , further comprising a pneumatic spring disposed between the granular supporting frame and the two shroud pieces, to open the two shroud pieces. 
     
     
         11 . The granulator shear pin safety mechanism of  claim 7 , further comprising a seat support, wherein the shear pin shroud is pivoted to the seat support through a shear pin, the remote roll adjust drive is fixed to the sear support through a torsion arm, such that the remote roll adjust drive is fixed to the granular supporting frame. 
     
     
         12 . The granulator shear pin safety mechanism of  claim 7 , wherein the latch clip comprises a latch connected with one of the shroud pieces, and a hook fixed to the other one of the shroud pieces, the latch has a handle pivoted with the one of the shroud pieces, the handle is hinged with a lock through a rotary shaft, the handle in operation is configure to engage the lock with the hook. 
     
     
         13 . The granulator shear pin safety mechanism of  claim 12 , wherein the lock is in a shape of C, and comprises two vertical sides in parallel and a transverse side between the two vertical sides and perpendicular to the two vertical sides, each of the two vertical sides is formed with thread, the two vertical sides are respectively inserted through the rotary shaft, a plurality of nuts are disposed at two sides of the rotary shaft and connected to the threads of the two vertical sides, and extension of the lock outside of the rotary shaft is adjusted through rotation of the nuts.